US8196507B2 - Actuator for active motor vehicle bonnet - Google Patents

Actuator for active motor vehicle bonnet Download PDF

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Publication number
US8196507B2
US8196507B2 US12/280,785 US28078507A US8196507B2 US 8196507 B2 US8196507 B2 US 8196507B2 US 28078507 A US28078507 A US 28078507A US 8196507 B2 US8196507 B2 US 8196507B2
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Prior art keywords
piston
pneumatic actuator
actuator according
cylinder
bonnet
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Expired - Fee Related, expires
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US12/280,785
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US20090095151A1 (en
Inventor
Joachim Schäfer
Volker Scheuch
Werner Schmidt
Martin Zilg
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GM Global Technology Operations LLC
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GM Global Technology Operations LLC
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Assigned to GM GLOBAL TECHNOLOGY OPERATIONS, INC. reassignment GM GLOBAL TECHNOLOGY OPERATIONS, INC. CORRECTION TO THE ASSIGNMENT RECORDATION COVER SHEET TO CORRECT THE TYPOGRAPHICAL ERROR IN THE ASSIGNEE NAME RECORDED AT REEL: 022005 AND FRAME 0260 Assignors: SCHMIDT, WERNER, ZILG, MARTIN, SCHEUCH, VOLKER, SCHAEFER, JOACHIM
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Assigned to GM GLOBAL TECHNOLOGY OPERATIONS, INC. reassignment GM GLOBAL TECHNOLOGY OPERATIONS, INC. RELEASE OF SECURITY INTEREST Assignors: CITICORP USA, INC. AS AGENT FOR BANK PRIORITY SECURED PARTIES, CITICORP USA, INC. AS AGENT FOR HEDGE PRIORITY SECURED PARTIES
Assigned to UNITED STATES DEPARTMENT OF THE TREASURY reassignment UNITED STATES DEPARTMENT OF THE TREASURY SECURITY AGREEMENT Assignors: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
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Assigned to GM GLOBAL TECHNOLOGY OPERATIONS, INC. reassignment GM GLOBAL TECHNOLOGY OPERATIONS, INC. RELEASE OF SECURITY INTEREST Assignors: UAW RETIREE MEDICAL BENEFITS TRUST
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/34—Protecting non-occupants of a vehicle, e.g. pedestrians
    • B60R21/38—Protecting non-occupants of a vehicle, e.g. pedestrians using means for lifting bonnets

Definitions

  • the present invention relates to a pneumatic actuator for an active bonnet for motor vehicles.
  • a bonnet By active bonnet a bonnet is understood which, in an accident, is lifted automatically by means of one or more actuators, in order to increase the clearance between the bonnet and the heavily deformable components located under it, and thus to provide a longer deformation path for a pedestrian hitting the bonnet. This prevents the risk of the pedestrian hitting the non-deformable vehicle body components, which could lead to life-threatening injuries.
  • DE 197 12 961 A1 and DE 103 31 018 A1 describe mechanical, spring-operated actuators.
  • a pressure spring acts on the body of the vehicle on the one hand, and on the other hand on an elongated hinge carrier, which at one end through a joint and another end through a catch, is anchored to the vehicle body, and which carries a multiple articulated hinge, which a movement causes to open or close the bonnet.
  • a disadvantage of this known mechanical actuator is that it requires powerful and very heavy springs for storing the energy sufficient to rapidly open the bonnet.
  • a more advantageous weight-to-operational energy ratio can be achieved through using a pneumatic actuator, operated, particularly, on pyrotechnical principles, through the ignition of a propelling charge.
  • pyrotechnical actuators have the problem in that the gas pressure used operate them is only available at the moment of lifting the bonnet. In normal operating circumstances, the cylinder of such an actuator is not under pressure, and any play of the piston with respect to the cylinder is transferred to the bonnet itself, when the bonnet is held only by actuators of this type.
  • constructions with predetermined breaking points are recommended, which, in normal operating conditions, remain intact and hold the bonnet closed securely, but, in a crash or accident, are destroyed, in order to facilitate the raising of the bonnet.
  • such an actuator comprises a cylinder and a piston which is transferred between a rest position and an extended position and which can be locked in the rest position, and a spring element, which pre-stresses the piston in its rest position in the direction of the extended state.
  • the pre-stress force of the spring element has to be as large as the forces acting on the bonnet under normal operating conditions during driving and on lifting or closing the bonnet, so that the bonnet stays fixed in the rest position.
  • the piston is directly connected to a bonnet hinge. That way, in a collision, the hinge is lifted together with the bonnet and does not have to be broken, as is the case in many accepted embodiments, in order to enable opening the bonnet.
  • the spring element which is on the piston next to it, attaches itself to the adjacent end of the bonnet hinge.
  • a rubbery-elastic article may be used simply and cost-effectively.
  • a rubbery-elastic body can comprise a high spring constant, so that a small degree of deformation is enough to achieve the required spring force.
  • the deformation of the body shall not be less than 1/10th of the piston stroke.
  • the spring element is jammed on the one hand between the cylinder and on the other the hinge carrier of the bonnet hinge, which is fixed to the piston.
  • the hinge carrier can be fixed to a piston rod by the simple means of screws.
  • the release of the piston and its movement into the extended state are preferably activated through a similar energy source.
  • the cylinder preferably comprises a gas inlet conduit for a gas propellant, which oriented in the movement direction of the piston, and a locking projection of the piston is held in the gas inlet conduit by a cross bar.
  • the locking projection preferably fills up the cross section of the inlet conduit. This serves to prevent, when the actuator is operated, the gas propellant from streaming into the cylinder and pushing against the piston before the cross bar has been released from the locking projection of the piston.
  • the cross bar In order to operate the movement of the cross bar, the cross bar shall preferably have a front side exposed to the gas and, through pressure on that side, the gas will be able to displace it from the inlet conduit.
  • the cross bar is preferably tapered towards its front side.
  • the cross bar When the cross bar intersects with a hole of the locking projection, it is preferably provided with at least one ridge which is in contact with the inner surface of the hole. This design minimizes the possible contact surface between the cross bar and the inner surface of the hole and so makes easier the displacement of the cross bar, which is of relevance above all in cases of non-optimal surface quality of the cross bar or the hole.
  • Ridges of this kind can be realized if the hole comprises particularly a round, and the cross bar a polygonal, cross-section.
  • the cross bar at one end, comprises a shoulder, which overlaps with the hole. This shoulder ensures that even the propellant pressure that enters between the cross bar and the inner surface of the hole will also be used to propel back the cross bar.
  • FIG. 1 is a motor vehicle with a bonnet lifted and held in an open position by the actuators;
  • FIG. 2 is an exploded perspective view of an actuator according to an embodiment of the invention
  • FIG. 3 is a schematic cross section of the actuator in FIG. 2 ;
  • FIG. 4 is a perspective view of a cross bar usable in the actuator.
  • FIG. 1 displays a schematic view of a motor vehicle with an engine bonnet 1 , lifted and held in that position by actuators 5 , 3 arranged adjacent to the front as well as rear frame of the bonnet 4 , 2 in a raised position, in which they are connected to the adjacent vehicle body components.
  • the bonnet 1 is supported only by the actuators 3 , 5 .
  • FIG. 2 displays an exploded perspective view of one of the two rear actuators 3 .
  • This comprises an extended cylinder 7 , which has two mounting flanges for mounting the cylinder 7 on a fixed frame of the motor vehicle.
  • On the bottom end of the cylinder 7 a gas inlet flange 9 with an inlet opening 10 provided.
  • a gas generator carrier 11 is provided, to be affixed airtight on to the gas inlet flange 9 .
  • the gas generator carrier 11 comprises chambers for three gas generators 12 , which are connected with the inlet opening 10 .
  • a destructible separator may be advisable, which breaks when the gas generator 12 is ignited in its own chamber, but which protects a gas generator 12 in housed in its own chamber from itself igniting as a result of the explosion in an adjacent chamber.
  • a lid 13 to be mounted on that side of the gas generator 11 , which is facing the cylinder 7 , contains an electric ignition device, which, on receiving the appropriate ignition command over a signal cable 14 ignites one of the gas generators 12 .
  • the actuator in FIG. 2 is thus in the position to operate the bonnet 1 three times before it is depleted and needs to be replaced.
  • the gas generator carrier 11 can house more or fewer than three gas generators 12 .
  • the number of the gas generators will not be greater than five or six, since the number of the times such emergency activation is expected throughout the service life of a motor vehicle is limited.
  • a piston rod 18 located at the upper front end 16 of the cylinder 7 , has a threaded tip.
  • the thread is provided in order to screw-attach a hinge carrier 19 , on which a link, or, in a preferred case, a single-articulation hinge, a hinge 17 , firmly attached to the bonnet, is linked.
  • a buffer component 20 of hard rubber or any other lightly elastic deformable material with a central hole 21 is provided, to be positioned on top of the piston rod 18 , and, in the rest position of the actuator, to be jammed and deformed between the hinge carrier 19 and the front 16 of the cylinder.
  • the piston rod 18 is locked in a rest position within in the cylinder 7 , in a manner to be described below in more detail.
  • the deformation of the buffer component 20 is strong enough to generate a reset force that is greater than any force acting on the bonnet 1 under normal circumstances, during driving or on opening or closing the bonnet 1 .
  • the buffer component undergoes no additional deformation, which means that the hinge carrier 19 is effectively unmovable with respect to the cylinder 7 and the vehicle body to which it is attached.
  • FIG. 3 displays an axial section of the cylinder 7 in FIG. 2 .
  • the piston rod 18 is affixed to a piston plate 22 , which, in the rest position shown in the figure, rests at the bottom of the interior chamber 23 of the cylinder.
  • a gas inlet conduit has an exterior section 24 , which extends from the inlet opening 10 at a right angle to the longitudinal axis of the cylinder 7 , and an axially oriented inner section 25 , which opens into the chamber 23 through its bottom.
  • a locking projection 26 extends into the inner section 25 , which is part of the piston 15 .
  • An upper section 27 of the locking projection 26 fills the inner section 25 of the gas inlet conduit entirely.
  • a lower section 28 the cross section of the locking projection 26 is reduced. Through this section 28 extends a hole 29 , which is aligned with the outer section 24 of the gas inlet conduit. Hole 29 has a slidable cross bar 30 . It is cylindrical in form, which tapers slightly on the front end 31 facing the inlet opening 10 . A circumferential flange at the opposite end forms a shoulder 32 , which is pushed against an arrester by a spring 33 .
  • a blocking body 34 tiered in cross section which is held, through a 33 , pushed against the lower tip of the locking projection 26 .
  • the gas propellant thus generated pushes against the end side 31 of the cross bar 30 and propels this back against the force of the spring 33 . Since the upper section 27 of the locking projection 26 initially still bars the gas inlet, the pressure remains low in the chamber 23 , and the frictional force required to slide the cross bar 30 is generated only through the buffer component 20 , which pushes the hinge carrier 19 upward.
  • the piston 15 can be simply pushed back in the cylinder 7 . This causes the locking projection 26 to engage again in the gas inlet conduit, pushing back finally the blocking body 34 , whereupon the cross bar 30 is returned inside the hole 29 .
  • the actuator is now ready for operation.
  • FIG. 4 displays a modified embodiment of the cross bar 30 .
  • the cross bar 30 in FIG. 3 it is provided to engage in a round hole 29 , whose outline is indicated by the dashed line in FIG. 4 .
  • the cross bar itself is however not cylindrical, but has a rhomboid shape in cross section, with four ridges 37 as the corners of the rhomboid, which are in the position to come in contact with the inner surface of the hole 29 , and are separated from one another by hollowed sections 38 .
  • the decrease in the contact surface between the cross bar 30 and the hole 29 prevents the cross bar 30 from getting stuck even when its surface, or the inner surface of the hole 29 , has been affected by multiple exposures to hot propellant gases from the gas generator 12 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Superstructure Of Vehicle (AREA)
  • Actuator (AREA)
  • Lock And Its Accessories (AREA)
US12/280,785 2006-02-27 2007-02-26 Actuator for active motor vehicle bonnet Expired - Fee Related US8196507B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102006008901.4 2006-02-27
DE102006008901 2006-02-27
DE102006008901A DE102006008901A1 (de) 2006-02-27 2006-02-27 Aktuator für eine aktive Haube
PCT/EP2007/001635 WO2007098906A1 (de) 2006-02-27 2007-02-26 Aktuator fur eine aktive haube

Publications (2)

Publication Number Publication Date
US20090095151A1 US20090095151A1 (en) 2009-04-16
US8196507B2 true US8196507B2 (en) 2012-06-12

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US12/280,785 Expired - Fee Related US8196507B2 (en) 2006-02-27 2007-02-26 Actuator for active motor vehicle bonnet

Country Status (7)

Country Link
US (1) US8196507B2 (de)
EP (1) EP1991449B1 (de)
CN (1) CN101389511B (de)
AT (1) ATE466752T1 (de)
DE (2) DE102006008901A1 (de)
RU (1) RU2414364C2 (de)
WO (1) WO2007098906A1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100089048A1 (en) * 2006-08-28 2010-04-15 Gm Global Technology Operations, Inc. Actuator for an active hood
US20150343990A1 (en) * 2012-12-21 2015-12-03 Key Safety Systems Inc Drive Device for Lifting a Vehicle Engine Hood Adapted to Protect Pedestrian
US9834164B1 (en) 2016-07-27 2017-12-05 GM Global Technology Operations LLC Impact sensor arrangements for active hood systems of motor vehicles
US9840140B1 (en) 2016-08-05 2017-12-12 GM Global Technology Operations LLC Compound-power-split electrically variable transmissions with motor clutching devices
US10704304B2 (en) 2017-10-26 2020-07-07 GM Global Technology Operations LLC Memory levers for latch mechanisms of vehicle compartment closure assemblies
US11007972B2 (en) 2017-09-22 2021-05-18 GM Global Technology Operations LLC Multi-pull latch and lock systems for compartment closure assemblies of motor vehicles
US11118381B2 (en) 2018-03-07 2021-09-14 GM Global Technology Operations LLC Dual-pull latch assemblies for compartment closure assemblies of motor vehicles

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008011731A1 (de) * 2008-02-28 2009-09-03 GM Global Technology Operations, Inc., Detroit Pneumatischer Aktuator
DE102010023283A1 (de) 2010-06-10 2011-12-15 Gm Global Technology Operations Llc (N.D.Ges.D. Staates Delaware) Kraftfahrzeugkarosserie mit reversierbarer Haube
DE102010026219A1 (de) 2010-07-06 2012-01-12 Gm Global Technology Operations Llc (N.D.Ges.D. Staates Delaware) Kraftfahrzeugkarosserie mit anhebbarer Haube
US8579068B2 (en) * 2011-06-02 2013-11-12 Ford Global Technologies, Llc Hood latch and striker system for pedestrian protection
JP5832024B2 (ja) * 2012-01-26 2015-12-16 富士重工業株式会社 車両用歩行者保護装置
CN104192091B (zh) * 2014-09-16 2016-10-26 江苏天诚车饰科技有限公司 一种发动机罩抬升装置
DE102014224259B4 (de) * 2014-11-27 2024-07-25 Van Halteren Technologies Boxtel B.V. Linearaktuator
CN106627472B (zh) * 2015-07-29 2019-02-26 比亚迪股份有限公司 发动机罩铰链结构及行人保护装置
JP6764242B2 (ja) * 2016-03-31 2020-09-30 株式会社Ｓｕｂａｒｕ 車両のサイクリスト保護装置
FR3085916B1 (fr) * 2018-09-14 2021-04-09 Autoliv Dev Dispositif de securite de vehicule pour apporter une protection pieton
CN113137152A (zh) * 2021-05-12 2021-07-20 厦门理工学院 一种发动机罩铰链和车辆

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100089048A1 (en) * 2006-08-28 2010-04-15 Gm Global Technology Operations, Inc. Actuator for an active hood
US8656716B2 (en) 2006-08-28 2014-02-25 GM Global Technology Operations LLC Actuator for an active hood
US20150343990A1 (en) * 2012-12-21 2015-12-03 Key Safety Systems Inc Drive Device for Lifting a Vehicle Engine Hood Adapted to Protect Pedestrian
US9701276B2 (en) * 2012-12-21 2017-07-11 Key Safety Systems, Inc. Drive device for lifting a vehicle engine hood adapted to protect pedestrian
US9834164B1 (en) 2016-07-27 2017-12-05 GM Global Technology Operations LLC Impact sensor arrangements for active hood systems of motor vehicles
US9840140B1 (en) 2016-08-05 2017-12-12 GM Global Technology Operations LLC Compound-power-split electrically variable transmissions with motor clutching devices
US11007972B2 (en) 2017-09-22 2021-05-18 GM Global Technology Operations LLC Multi-pull latch and lock systems for compartment closure assemblies of motor vehicles
US10704304B2 (en) 2017-10-26 2020-07-07 GM Global Technology Operations LLC Memory levers for latch mechanisms of vehicle compartment closure assemblies
US11118381B2 (en) 2018-03-07 2021-09-14 GM Global Technology Operations LLC Dual-pull latch assemblies for compartment closure assemblies of motor vehicles

Also Published As

Publication number Publication date
EP1991449A1 (de) 2008-11-19
RU2414364C2 (ru) 2011-03-20
ATE466752T1 (de) 2010-05-15
EP1991449B1 (de) 2010-05-05
US20090095151A1 (en) 2009-04-16
DE102006008901A1 (de) 2007-08-30
CN101389511B (zh) 2011-08-17
RU2008138581A (ru) 2010-04-10
DE502007003656D1 (de) 2010-06-17
WO2007098906A1 (de) 2007-09-07
CN101389511A (zh) 2009-03-18

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